.clearfix{
  zoom: 1;
}
.clearfix:after{
  display: block;
  clear:both;
  content: '';
  height:0;
  visibility: hidden;
}
body, div, ul, li, h1, h2, h3, h4, h5, h6, p, dl, dt, dd, ol, form, input, textarea, th, td, select{
  margin: 0;
  padding: 0;
}
